Fix HMR/Live Reloading when running against webpack v5 and have an array of targets when using webpack-dev-server v3

[greyepoxy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Updated the existing addEntries web targets test

Motivation / Use-Case

Since v4 is not out yet (where this issue is fixed) this fixes the live reload issue #2758 that occurs when a user is using webpack v5.

Breaking Changes

None

Additional Info

Tested against the examples and my own private webpack v5 config to confirm that it detected that the config was a web config.

Looking at the fix in the v4 branch I suspect this will not work as well as that change. Specifically if someone uses the new browserlists target option this change won't detect that as a web config. Since this change only needs to hold people over until v4 is released I believe its okay since in the example above the user could just add web to their target array.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v3@5cb545f). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             v3    #3271   +/-   ##
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  Files         ?       34           
  Lines         ?     1337           
  Branches      ?      384           
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  Hits          ?     1250           
  Misses        ?       85           
  Partials      ?        2           

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[snitin315]

You can use v4.0.0-beta.3, Just a couple of more PRs and we will do a stable release in the near future.

[greyepoxy]

Yes I am aware this is fixed in v4 but due to that version still being in beta my company will not update (Tableau) due to the risk of issue. I was hoping to send this request a few weeks ago but only got permission to make the commit recently.

[alexander-akait]

Make sense as patch release, I will try to do release in near future

[greyepoxy]

@alexander-akait just checking that you are not waiting on me for something, thank you

[alexander-akait]

Yep, I am here, I am working on rc release for v4, after this I will backport some fixes to v3 too

[bartvandenende-wm]

it would be great indeed to see this change backported to 3.x for compatibility

[getsetgopi]

Since my company still supports IE11. It fails when I use target: ["web", "es5"]. I waiting for the fix where live reload and this works together.